We found the perfect solution to sigaret butts lying around. We will let the city clean itself using their existing ecosystem: crows. Our Crowbar is a machine that will educate, train and reward crows to collect cigarette filters in exchange for food. The machine is using a proven 4-step process to make crows associate the collection of cigarette filters with getting food. For every cigarette filter they drop in the Crowbar, they will get a bit of food as a reward. The Crowbars can be placed all over the city without having a big impact on the city existing infrastructure.